1. Keep your core muscles engaged during all workouts. Just doing the exercise isn't enough. Engage your core muscles during each exercise to receive the most ... 2. Do planks. Planks are simple and engage all your core abdominal muscles, making them an excellent exercise for tightening your core. To do one, get in push ... 3. Do side planks. Lie on one side and brace yourself on your elbow. Put your legs on top of each other. Place your other arm on top of your hip or reach it up ...
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